Corey Lake is a cold, clear oligotrophic lake in St. Joseph County, Michigan. Water quality is graded A based on 1 sampling years through 2022. Overall water quality is improving over recent sampling years. The lake supports 13 documented fish species including Bluegill, Bluntnose minnow, and Grass pickerel. Public access is available. Compared to the 12 other monitored lakes in St. Joseph County, Corey Lake ranks #1 for water quality.
Source: EPA Water Quality Portal sampling records, Michigan DNR, last sampled 2022-09-17. Grade methodology: LakeGrade methodology.
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Swimming Safety
Excellent for swimming, crystal clear water with minimal algae
Water Quality Grade: A, Excellent
Crystal clear, you can see 16 ft down. Trophic State Index: 37.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 16 ft | A |
| Phosphorus | No data | |
| Chlorophyll-a (Algae) | No data | |
| Trophic State Index (TSI) | 37 | Oligotrophic |
Low nutrients, clear water, excellent for swimming
Where to stay near Corey Lake
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Fish Species
Click a species to see every graded lake where it is documented.
Fishing Corey Lake
Water Quality Trend: ↑ Improving
Based on 3 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↑ Improving | +0.22 m/yr | 3 |
Location & Depth Map
Free interactive depth-contour map of Corey Lake, reaching a maximum surveyed depth of 70 ft. Toggle Depth contours to overlay the bathymetric survey lines. Contour data from Michigan DNR.
County Ranking
Ranked #1 of 13 lakes in St. Joseph County
Nearby Lakes in St. Joseph County
Explore Corey Lake across LakeGrade
Fish species and top-graded lakes across Michigan
Fish species and best lakes in St. Joseph County
Species activity outlook by water temperature and season
Where to stay at Michigan's top lakes, each with its grade
Low nutrients, clear water, excellent for swimming
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More Michigan Lake Rankings
Other Grade A Lakes in Michigan
Cass County · Clarity: 13 ft
Van Buren County · Clarity: 13 ft
Cass County · Clarity: 16 ft
Van Buren County · Clarity: 17 ft
Van Buren County · Clarity: 15 ft
Allegan County · Clarity: 14 ft
Oligotrophic Lakes in Michigan
More records, surveys & data sources
Lake Size & Watershed
Size, shoreline, and watershed area from HydroLAKES (HydroSHEDS). Mean depth is a modeled estimate.
Data Sources
Water quality data from the EPA Water Quality Portal
Lake size & watershed from HydroLAKES (HydroSHEDS)
Grading methodology based on Metropolitan Council standards
Most recent sample: 2022-09-17
Monitoring stations: 1